/**
 *
 0x55642b54c008 4

 *
 */
#include<stdio.h>
#include<string.h>
int main(){
	char* s1 = "how are you";
	char* s2 = "are";
	char* r = NULL;
	r = strstr(s1, s2);
	printf("%p %ld\n", r, r-s1);
	return 0;
}
